短語詞組短語railway level -crossing 鉄路平交道口Level -Crossing Detector 過電平檢測器level -crossing keeper's house 平交道口看守房a level -crossing keeper 的中文意思electric level -crossing gong 道口大門電警鍾automatic level crossing signal 道口自動信號level crossing accident [交]道口事故 返回 level crossing